Defendant requested a jury and posted jury fees but withdrew his jury request the first day of trial.  Plaintiff then demanded a jury but hadn’t posted jury fees.  The trial court found plaintiff had waived the right to a jury trial and it denied relief from that waiver.  Plaintiff did not immediately seek a writ to challenge the waiver ruling. The waiver finding was correct.  Under CCP 631(f), each party must post jury fees, even if other parties have already done so, in order to avoid waiver of the right to a jury trial.  Refusing to follow Mackovska v. Viewcrest Road Properties, LLC (2019) 40 Cal.App.5th 1, this decision holds that if the party does not seek writ relief, it must show prejudice from having a judge trial in any later appeal from the judgment–otherwise, the appellant could gamble on a favorable outcome before the judge and appeal only if it lost the gamble.  The trial court did not abuse its discretion in denying relief from waiver under CCP 631(g) as plaintiff intentionally failed to pay jury fees and didn’t move for relief until the first day of trial.  The party opposing relief from waiver need not show it would be prejudiced if relief from waiver is granted.